<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="js/jquery.min-3.3.1.js"></script>

</head>
<body>
<div id="myDiv">麻蛋</div>

<button id="open_background">tmd </button>
</body>
</html>
<script>
    $('#open_background').click(e => {
        $('#myDiv').text('给老子变')
    })
</script>
